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| Biddulphia tuomeyi var. elongata (Pantocsek) Forti 1910 |
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| Cerataulus laevis var. schmidtii Forti 1910 |
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| Cerataulus laevis f. trimera Forti 1910 |
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| Cerataulus laevis var. typica Forti 1910 |
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| Cerataulus orbicularis Forti 1910 |
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| Cerataulus polymorphus var. petitii (Leuduger-Fortmorel) Forti 1910 |
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| Cerataulus thermalis var. paludosa Tempère & Peragallo ex Forti 1910 |
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| Cerataulus thermalis var. sinensis (Grunow) Forti 1910 |
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| Cerataulus turgidus var. terryana Kain in Forti 1910 |
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| Coscinodiscus moronensis f. major Forti 1910 |
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| Coscinodiscus papulosus Forti 1910 |
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| Coscinodiscus rhombicus var. italicus Forti 1910 |
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| Gephyria media var. ardissoniaeformis Forti 1910 |
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| Gomphocymbella beccarii (Grunow) Forti 1910 |
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| Hyalodiscus radiatus var. minor Forti 1910 |
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| Leudugeria janischii var. brevis Forti 1910 |
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| Melosira clavigera f. cassiradiata Forti 1910 |
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| Melosira clavigera f. trinotata Forti 1910 |
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| Melosira sulcata var. radiata Forti 1910 |
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| Navicula praetexta f. minor Forti 1910 |
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